双曲型冷却塔在水平和垂直地震作用下的地震反应

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
Jun-Feng Zhang, Yuanhong Wang, Jie Li, Lin Zhao
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引用次数: 0

摘要

在对具有代表性的双曲型冷却塔进行动力特性分析和阐述后,对其进行了线性响应谱分析(RSA)和响应历史分析(RHA)。详细说明了塔壳的地震反应,包括内力振幅、模态贡献、阻尼比的影响、RSA和RHA结果的比较,特别是内力的纬度分布。结果表明,根据振型的不同,本征振型可分为四种类型,只有横向弯曲振型和竖向拉伸振型对水平地震和竖向地震有意义。弯曲模态和地震变形均表现为整体侧向弯曲伴截面微小圆周流动位移的特征。这个特征也决定了内力的纬度分布是正弦还是余弦。此外,本文还提出了一种无需耗时的响应历史分析即可近似估计内力幅值的方法:先得到所选地面加速度的响应谱,然后比较第一阶侧向弯曲模态自然周期的响应谱值,因为第一阶侧向弯曲模态对于水平地震反应总是首要优势的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic responses of hyperbolic cooling towers under horizontal and vertical earthquake
Following the dynamic property analysis and elaboration, linear response spectrum analysis (RSA) and response history analysis (RHA) were conducted on a representative hyperbolic cooling towers (HCT) in present study. The seismic responses in tower shell were illustrated in detail, including the internal force amplitude, modal contribution, influence from damping ratio, comparison of results got from RSA and RHA and especially the latitude distributions of internal forces. The results show that the eigenmodes could be classified in a new method into four types according to their mode shapes and only the lateral bending modes and vertical stretching modes are meaningful for horizontal and vertical earthquake correspondingly. The bending modes and seismic deformation display the same feature which is global lateral bending accompanied by minute circular flow displacement of section. This feature also decides the latitude distributions of internal forces as sine or cosine. Moreover, the following method is also proposed for approximate estimation of internal force amplitudes without time-consuming response history analysis: getting the response spectrums of the selected ground accelerations and then comparing values of response spectrums at the natural period of first lateral bending mode because it is always prime dominant for horizontal seismic responses.
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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